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155e7524 FI |
1 | /* |
2 | * linux/fs/nfs/blocklayout/blocklayout.c | |
3 | * | |
4 | * Module for the NFSv4.1 pNFS block layout driver. | |
5 | * | |
6 | * Copyright (c) 2006 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Andy Adamson <andros@citi.umich.edu> | |
10 | * Fred Isaman <iisaman@umich.edu> | |
11 | * | |
12 | * permission is granted to use, copy, create derivative works and | |
13 | * redistribute this software and such derivative works for any purpose, | |
14 | * so long as the name of the university of michigan is not used in | |
15 | * any advertising or publicity pertaining to the use or distribution | |
16 | * of this software without specific, written prior authorization. if | |
17 | * the above copyright notice or any other identification of the | |
18 | * university of michigan is included in any copy of any portion of | |
19 | * this software, then the disclaimer below must also be included. | |
20 | * | |
21 | * this software is provided as is, without representation from the | |
22 | * university of michigan as to its fitness for any purpose, and without | |
23 | * warranty by the university of michigan of any kind, either express | |
24 | * or implied, including without limitation the implied warranties of | |
25 | * merchantability and fitness for a particular purpose. the regents | |
26 | * of the university of michigan shall not be liable for any damages, | |
27 | * including special, indirect, incidental, or consequential damages, | |
28 | * with respect to any claim arising out or in connection with the use | |
29 | * of the software, even if it has been or is hereafter advised of the | |
30 | * possibility of such damages. | |
31 | */ | |
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
fe0a9b74 JR |
34 | #include <linux/mount.h> |
35 | #include <linux/namei.h> | |
155e7524 FI |
36 | |
37 | #include "blocklayout.h" | |
38 | ||
39 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
40 | ||
41 | MODULE_LICENSE("GPL"); | |
42 | MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>"); | |
43 | MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); | |
44 | ||
fe0a9b74 JR |
45 | struct dentry *bl_device_pipe; |
46 | wait_queue_head_t bl_wq; | |
47 | ||
155e7524 FI |
48 | static enum pnfs_try_status |
49 | bl_read_pagelist(struct nfs_read_data *rdata) | |
50 | { | |
51 | return PNFS_NOT_ATTEMPTED; | |
52 | } | |
53 | ||
54 | static enum pnfs_try_status | |
55 | bl_write_pagelist(struct nfs_write_data *wdata, | |
56 | int sync) | |
57 | { | |
58 | return PNFS_NOT_ATTEMPTED; | |
59 | } | |
60 | ||
9e692969 | 61 | /* FIXME - range ignored */ |
155e7524 | 62 | static void |
9e692969 | 63 | release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range) |
155e7524 | 64 | { |
9e692969 FI |
65 | int i; |
66 | struct pnfs_block_extent *be; | |
67 | ||
68 | spin_lock(&bl->bl_ext_lock); | |
69 | for (i = 0; i < EXTENT_LISTS; i++) { | |
70 | while (!list_empty(&bl->bl_extents[i])) { | |
71 | be = list_first_entry(&bl->bl_extents[i], | |
72 | struct pnfs_block_extent, | |
73 | be_node); | |
74 | list_del(&be->be_node); | |
75 | bl_put_extent(be); | |
76 | } | |
77 | } | |
78 | spin_unlock(&bl->bl_ext_lock); | |
155e7524 FI |
79 | } |
80 | ||
81 | /* STUB */ | |
82 | static void | |
83 | release_inval_marks(struct pnfs_inval_markings *marks) | |
84 | { | |
85 | return; | |
86 | } | |
87 | ||
88 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
89 | { | |
90 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); | |
91 | ||
92 | dprintk("%s enter\n", __func__); | |
93 | release_extents(bl, NULL); | |
94 | release_inval_marks(&bl->bl_inval); | |
95 | kfree(bl); | |
96 | } | |
97 | ||
98 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, | |
99 | gfp_t gfp_flags) | |
100 | { | |
101 | struct pnfs_block_layout *bl; | |
102 | ||
103 | dprintk("%s enter\n", __func__); | |
104 | bl = kzalloc(sizeof(*bl), gfp_flags); | |
105 | if (!bl) | |
106 | return NULL; | |
107 | spin_lock_init(&bl->bl_ext_lock); | |
108 | INIT_LIST_HEAD(&bl->bl_extents[0]); | |
109 | INIT_LIST_HEAD(&bl->bl_extents[1]); | |
110 | INIT_LIST_HEAD(&bl->bl_commit); | |
111 | INIT_LIST_HEAD(&bl->bl_committing); | |
112 | bl->bl_count = 0; | |
113 | bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT; | |
114 | BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize); | |
115 | return &bl->bl_layout; | |
116 | } | |
117 | ||
118 | static void | |
119 | bl_free_lseg(struct pnfs_layout_segment *lseg) | |
120 | { | |
121 | } | |
122 | ||
123 | static struct pnfs_layout_segment * | |
124 | bl_alloc_lseg(struct pnfs_layout_hdr *lo, | |
125 | struct nfs4_layoutget_res *lgr, gfp_t gfp_flags) | |
126 | { | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | static void | |
131 | bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, | |
132 | const struct nfs4_layoutcommit_args *arg) | |
133 | { | |
134 | } | |
135 | ||
136 | static void | |
137 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) | |
138 | { | |
139 | } | |
140 | ||
141 | static int | |
142 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) | |
143 | { | |
144 | dprintk("%s enter\n", __func__); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static int | |
149 | bl_clear_layoutdriver(struct nfs_server *server) | |
150 | { | |
151 | dprintk("%s enter\n", __func__); | |
152 | return 0; | |
153 | } | |
154 | ||
e9643fe8 BH |
155 | static const struct nfs_pageio_ops bl_pg_read_ops = { |
156 | .pg_init = pnfs_generic_pg_init_read, | |
157 | .pg_test = pnfs_generic_pg_test, | |
158 | .pg_doio = pnfs_generic_pg_readpages, | |
159 | }; | |
160 | ||
161 | static const struct nfs_pageio_ops bl_pg_write_ops = { | |
162 | .pg_init = pnfs_generic_pg_init_write, | |
163 | .pg_test = pnfs_generic_pg_test, | |
164 | .pg_doio = pnfs_generic_pg_writepages, | |
165 | }; | |
166 | ||
155e7524 FI |
167 | static struct pnfs_layoutdriver_type blocklayout_type = { |
168 | .id = LAYOUT_BLOCK_VOLUME, | |
169 | .name = "LAYOUT_BLOCK_VOLUME", | |
170 | .read_pagelist = bl_read_pagelist, | |
171 | .write_pagelist = bl_write_pagelist, | |
172 | .alloc_layout_hdr = bl_alloc_layout_hdr, | |
173 | .free_layout_hdr = bl_free_layout_hdr, | |
174 | .alloc_lseg = bl_alloc_lseg, | |
175 | .free_lseg = bl_free_lseg, | |
176 | .encode_layoutcommit = bl_encode_layoutcommit, | |
177 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, | |
178 | .set_layoutdriver = bl_set_layoutdriver, | |
179 | .clear_layoutdriver = bl_clear_layoutdriver, | |
e9643fe8 BH |
180 | .pg_read_ops = &bl_pg_read_ops, |
181 | .pg_write_ops = &bl_pg_write_ops, | |
155e7524 FI |
182 | }; |
183 | ||
fe0a9b74 JR |
184 | static const struct rpc_pipe_ops bl_upcall_ops = { |
185 | .upcall = bl_pipe_upcall, | |
186 | .downcall = bl_pipe_downcall, | |
187 | .destroy_msg = bl_pipe_destroy_msg, | |
188 | }; | |
189 | ||
155e7524 FI |
190 | static int __init nfs4blocklayout_init(void) |
191 | { | |
fe0a9b74 JR |
192 | struct vfsmount *mnt; |
193 | struct path path; | |
155e7524 FI |
194 | int ret; |
195 | ||
196 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); | |
197 | ||
198 | ret = pnfs_register_layoutdriver(&blocklayout_type); | |
fe0a9b74 JR |
199 | if (ret) |
200 | goto out; | |
201 | ||
202 | init_waitqueue_head(&bl_wq); | |
203 | ||
204 | mnt = rpc_get_mount(); | |
205 | if (IS_ERR(mnt)) { | |
206 | ret = PTR_ERR(mnt); | |
207 | goto out_remove; | |
208 | } | |
209 | ||
210 | ret = vfs_path_lookup(mnt->mnt_root, | |
211 | mnt, | |
212 | NFS_PIPE_DIRNAME, 0, &path); | |
213 | if (ret) | |
214 | goto out_remove; | |
215 | ||
216 | bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL, | |
217 | &bl_upcall_ops, 0); | |
218 | if (IS_ERR(bl_device_pipe)) { | |
219 | ret = PTR_ERR(bl_device_pipe); | |
220 | goto out_remove; | |
221 | } | |
222 | out: | |
223 | return ret; | |
224 | ||
225 | out_remove: | |
226 | pnfs_unregister_layoutdriver(&blocklayout_type); | |
155e7524 FI |
227 | return ret; |
228 | } | |
229 | ||
230 | static void __exit nfs4blocklayout_exit(void) | |
231 | { | |
232 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", | |
233 | __func__); | |
234 | ||
235 | pnfs_unregister_layoutdriver(&blocklayout_type); | |
fe0a9b74 | 236 | rpc_unlink(bl_device_pipe); |
155e7524 FI |
237 | } |
238 | ||
239 | MODULE_ALIAS("nfs-layouttype4-3"); | |
240 | ||
241 | module_init(nfs4blocklayout_init); | |
242 | module_exit(nfs4blocklayout_exit); |